Automatic selective system.



No. 707,056. Patented Au'g. [2,1902.

C. D. EHRET. AUTOMATIC SELECTIVE SYSTEM.

(Application filed Jan. '10, 1902.)

{No Model.)

gnven rob witmmoa I 30 devices.

UNITED STATE P TEN F ICE CORNELIUS D. EHRET, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY

DIRECT AND MESNE ASSIGNMENTS,

TO AMERICAN WIRELESS, TELEPHONE AND TELEGRAPH COMPANY, A CORPORATION OF ARIZONA TERRITORY, 1 AND THE CONSOLIDATED WIRELESS-TELEGRAPH AN DTELEPHONE COM- PANY, A CORPORATION-OF ARIZONA TERRITORY.

AUTOMATIC SELECTIVE SYSTEIIVLY SPECIFICATION forming part of Letters Z Patent No. 707,056, dated August 12, 1902.-

Application filed JanuaryldtlQOZ Serial No. 89,211. (No model.) I

1 5 State of Pennsylvania, have'in'ventejd a new and useful Automatic Selective System, "of

which the following is a specification.

My invention relates to a signaling system in which the energy controlled is transmitted '10 through natural media, such energy being electrostaticor electromagnetic or a combination of both., a p p It comprises an automatic selecting device whereby one station may be put into commu- I 5 nication with any other ofja series orgroup;

each station always transmitting messages by energy of a definite frequency orfrequencies.

It comprises, further,at each station a number of receiving-conductors or combinations of conductors equal to theremaining number of stations in the seriesor group and each conductor or combination of conductors syntonizedwith the frequency'or frequenoiesof the energy-waves radiated from some certain 2 5 other station in the group;

It comprises, further, a sunflower or commutator for throwing the aforementioned syntoniz ed conductors successively into electrical communication with wave-responsive It comprises, f urther,a pilot wave-responsive device which if energy of acertain frequency persists for a predetermined interval of time causes a main .message-receiving wave-responsive device to be brought intothe influence of the arriving energy,

It comprises, further, means for operating and controlling the commutator and an arrangement of circuits for receiving and transo mitting and other features, which are hereinafter described, and pointed outiu the claims. Referring to the drawing, D is the receiving conductor, which connects through switch-arm 2 with a segment in electrical communication with six different inductances L L L L L L, which in turn connect, respectively, with separate segments of the sunflower U, each being represented by a conducting mass 4, and with interveninginsuelation between successive segments. Over these segmentstrails a brush or trailer 3, rigid withihe'shaft I, which is driven by a motor.. (Shown in plan view at Secured tothis shaft 1 is a notched disk J, having as many notches'5 ,as there are segments in the sunflower. Into these notches is adapted to fall or be raised a lug 6 on the armature a,-contro1led by the-relay V. a

; Bearing upon and in electrical contact with the'shaft I is a brush secured at F. From said brushthere is a connection to earth-plate ethro ugh wave-responsive device C, In shunt around said wave-responsive device is the winding of the relay S, which is energized upon a change of condition, in the wave-responsive device byloattery g. The armature act the relay S is normally retracted by a spring 8 against stop b. When attracted, v however, it contacts with screw 0, causing the energization of relay-coils O and Vfrom the battery g. v V H The motor M receives its current from the supply-circuit t t, which communicates through the armature ct and contact-screw 0.- Upon the energization of the relay 'V armature a is attracted in opposition to the force exerted by a spring 5, resulting in the movement .of the armature against the stop I), when the lug '6 comes opposite a notch 5 in the disk J, and also resulting in the rupture of the motor-circuit at contact-screw 0'. At the same time relay V operates relay 0 attr'acts its armature a away from back-stop b and causes the metallic'bridges 1", carried terial '0, to bridge the contact-points 5T 2 and 53,2 This latter operation throws wave-re sponsive device C into-communication with the brush'bearing upon the shaft I and puts the'ot her terminal of said device in connec- I tion with earth-plate e. A change of condi- 4 tion in the wave-responsive device C due-to the received'energy is manifested by a change of current strength through the winding of the relay R, such current being derived from the battery 9 V by the armature and insulated from itbyma 85 (3,1 term the pilot wavemesponsive de-' vice, and G the main responsive device wh ich controls the message-'recordin g relayR.

J The electrical constants of the circuit em- 5 bracing the receiving-conductor D and, for example, the inductance L trailer 3,the brush, andea'rth connection are such that it is resonant with the transmitted energy.v The receiving-conductor D, takentin conjunction 10 with each of the remaining inductances, pro- 'duces as many other circuits resonant to as many difierent frequencies. For example, the conductor Dandlthe inductance L will correspond'with .the frequencies of the energy- 'IS transmitted from station 'No.'1.-. D,jtake'n'iu conjunction .with inductance L will select the energy transmitted from station No. 2, and so on thronghout.theseries. a p 1 In place ofthe inductances L L &c., may be used condensers of diflerentcapacities, so that, taken with the inductances of D or the combined inductanceand capacity of D, circuits of dilferent constants are obtained for the purpose of beingselective to energies of diiterent frequencies. 3 The inductancesand capacities are termed frequency-determim ingelements. 1 f t f I The operation of the device is as follows:- The trailer 3 is constantly rotatinginpassing over-the segments of thesunfiower succes sively. Supposing station N0. 2 isfcalli'ng station No. .7, (the station here shown3) when trailer 3 has come into connection Withthe segment with which the inductance L is connectedthe wave-responsive device Chas its condition altered with a-resulting energization of the relay-coil S. This occurs "the instant that trailer 3 moves onto the segment in connectionwiththeinductauceU. Arma- 4o 0. This causes the energi'zation ofthe relays O and V, as, above described; but the'armatures af and a are retarded by the means of dash-pots or equivalent devices 1) p respectively, and do not reach the limit of their travel unless the energy-radiated fromstae tion No. 2 is persistent for a sulficiently long time. If this should'be the'case, lug 6 engages after a time in a notch '5, lockingthe disk J and preventing the trailer 3 from leaving thesegmentin connection with the inductance I}. At the same time the circuit of the motor M is broken at screw'c. The armature of the relay 0 has caused the bridging of the contacts and the throwing into operation of the wave responsive device 0, a'sbefore described. The relay R then records the 7 messages. r I j The angular position of disk J with respect 60 to sunflower U is such that it is locked before the trailer leaves the segment represent ing the proper station. f

When it is desired to transmit from station No. 7, the double pole-switch N-is thrown to the left, so that blade 1, which is in communication with the earth, contacts with point 7 voae'sc device Ointo a likecondition lure a is attracted and contacts withscrew.

' aconductor'for-receiving'the energy from the,

a receiving device controlled-by there'ceive its switch. The efiect isto'throw into-con nection with the-conductor D the transmitter" V T. The inductance L 'isflof suchimagnitude that takeninconnection with theconducto 'D the station No. 7 emitswave's of frequen distinctly its own. StationNo, 2,,{forrexam ple, haslin place or ind uctanceL here" show the inductance L7, so as; tobe'selective to the f energy radiated from} this static There mainingstationso'f the groupsare si'milarly arranged. The efliect of contact vbetwee ,blade 1 and point 7 is toshort-circuitthe Wav responsive device C and protect-itl fromt energy-being transmitted; Flhi's hortcircuitcauses also the'relay-coil' S. to, ttract its. mature at, which in turn clos v he circuit 0 the relay-coil O andthrows ;wave-responsi of-short ir rot, the same purpose. f 7

It is to be uuderstoodthat. v p sin gle inductanceto corr'espondvvith each'tra'ns mitting-station a combination.ofinductanc" mayfbeused or other variations made; in the; electrical copstants whereby selectivityjmay be obtained, and other means mayberu'sedfo driving the sunflower, locking itin'to posit-ion, 8 0., without departing from the spirit'of I y invention. a V

What Iclaimis+, 1. In asignalingsystem,'apluf li ofequency-determining elements, a. unfiower', frequency-determining' eleme on'r 'n ectedf to each segmentjofthe sunflowegmeansfor" tating the trailer over thesegments of s id sunflower, and a wavere'sponsive do electrical communication with said trarle 2. In a signaling system, conductor i c fluenced-by energy transnii ,through the natural media, a'receiving' device in comm nication-with said 'conductor,-and automat1c means; responsivetd the r ceived energy for lccking the receivingdeviceinpos n to r ceive a message from a desired stationonly.

- 3. Ina signaling system thecombina'tion natural media, a pilot wave-responsived co and a main responsivede 'ce vcontr lled y; said pilot device. "I; V L i eh-In asignaling system, a cond ,7 fluenced ,by energy transmittedthrough the natural media, a plurality of elements for.re'n' derin g the circuit of said receivin'gsconductorj selective of energies of difierentfrequencies;

energy, and means for locking'the receivin mechanism inposition to respond' to energy of'a desired and predetermined-frequency" 5.;In a signaling. system, a conductorgln fluenced by; energyof a definite frequenc transmitted through the natural media, are ceiver controlled by s'uch energy, and auto maticmeans for locking said receiveriin position to receive energy from a desired station only. 6. In a signaling system,fa conductor in fluenced byenergyof definite frequency trans I 1 and blade 2 contacts with theleft segment of mitted through the natural media, areceiver' controlled by such energy, and automatic means for locking said receiver in position to receive energy from a desired station only after the persistence of such energy for adefinite interval of time.

7. In a wireless signaling system, the combination of a receiving-conductor, a pilot wave-responsive device, and a mainrespon sive device broughtinto action by the pilot device. 4 a I 8. In a wireless signaling system, the combination of a receiving-conductor, a pilot wave-responsive device, and a main Wave-responsive device brought into 'action by the pilot device after the persistence. of transmitted energy for a definite interval of time.

9. In a wireless signaling system, the combination of a receiving-conductor, a pilot Wave-responsive device, and a main Wave-responsive device brought into action by the pilot device after the persistence for a definite interval of'time of transmitted energy of a definite frequency. i

10. In a signaling system,a plurality of conductors, each selective of energy of definite frequency, a receiver,and means for maintaining the receiver in communication with. a conductor during the persistence of energy of a frequency of which said conductor is selective.

11. In asignaling system, a plurality of conductors, each selective of energy of a definite frequency, a receiver, and automatic means for maintaining the receiver in communication with a'conductor during the persistence of energy of a'definite frequency of which said conductor is selective.

12. In asignalingsystem, a pluralityofconductors each selective of energy of'a definite frequency, a receiver, and means for locking the receiver in communication with a conduc-' tor during the persistence of energy of a frequency of which said conductor is selective.

13. In asignaling system, aplurality of con-Q ductors each selective of energy of definite frequency, a receiver, and automatic means for? locking the receiver in communication with'a conductor during the persistence of energyof a definite frequency of which said conductor is selective. j

14. In a wireless signaling system, a plu-' rality of conductors, a receiver, and automatic means for locking the receiver in comm unication with a certain conductor.

15. In a wireless signaling system, a plurality of'conductors selective of energies of different frequencies, a receiver, and automatic means for locking the receiver in communication with a certain conductor.

rality of transmitting-stations, and automatic means for putting' a receiver in communication With a certain station.

17. In a wireless signaling system, a pluralityrof transmitting-station s, each emitting a characteristic energy, and automatic'means for putting a receiver in communication with a certain station.

18.- ha wirelessxsignalingsystem, a plurality of transmitting-stations, and automatic means't'or locking a receiver in communication with a certain station.

19. In a wireless signaling system, a plurality of transmitting-stations, each emitting a characteristic energy, and automatic means for locking areceiverin communication with a certain station. I l

20. In a wireless signaling system,ja plurality of transmitting-stations, a"r eceiver, a wave-,responsivedevice and means controlled thereby for putting the receiver in communication with a certain station,

21.' In a wireless signaling system, aplurality of transmitting-stations each emitting characteristic energy, a receiver, a wave r'esponsive device and means controlled thereby for putting a receiver in communication with a certain station.

22. In a wireless signaling system, a plurality of transmitting-stations, a receiver, a pilot wave-responsive device and means controlled thereby for putting the receiver in communication with a certain station.

23. Ina wireless signaling system, a plurality of transmitting-stations, each emitting characteristic energy,a receiver, a pilot waveresponsive device and means controlled thereby for putting the receiver in communication IOO vice for putting the main wave-responsive device into communication with a certain station.

25. In a wireless signaling system, a rality of transmitting-stations each emitting characteristic energy,a pilot wave-responsive device, a main wave-responsive device, and means controlled by the pilot device for put ting the main wave-responsive device into communication with a certain station.

CORNELIUS D. EHRET.

Witnesses:

MAE HOFMANN, P. M. MAOLAREN.

IIO 

